When i did a few paid drug research trials back in the day, to collect the money, you had to provide a somewhat clean urine sample, thc was only allowed along with anything rx'd, but the setup was a bathroom that had a 2 way mirror and an indian guy that sat in there all day and watched ppl piss lol, when you were done he would take the temp of the sample. I was dirty for one of them and tried to use lab urine but the temp was off plus he must look really close at your wang bc i had athin tube running next to mine that was connected to a bag under my arm. I got all mad and ripped everything off and tossed it in the trash. When leaving i said have fun looking at dongs all day haha. Long story short i came back a few weeks later gave a clean sample and got my check. What a shitty job, sitting in a room watching dudes piss all day, unless you are maybe gay and have a piss fetish.